1. References used in this Scientific Opinion are available and are listed in the Scientific Report www.efsa.eu.int
2. Working Group Members and Acknowledgements
3. J. M. Sharp D. M. Broom H. Clough L. Crosta G. Dorrestein E. Kaleta K. Stafford G. Theodoropoulos
4. The scientific co-ordination for this Scientific Opinion has been undertaken by the EFSA AHAW Panel Scientific Officer O. Ribó
5. AHAW Scientific Panel Members